Hello Richard, Wednesday, May 9, 2007, 9:10:22 PM, you wrote:
RE> Robert Milkowski wrote: >> Hello Mario, >> >> Wednesday, May 9, 2007, 5:56:18 PM, you wrote: >> >> MG> I've read that it's supposed to go at full speed, i.e. as fast as >> MG> possible. I'm doing a disk replace and what zpool reports kind of >> MG> surprises me. The resilver goes on at 1.6MB/s. Did resilvering get >> MG> throttled at some point between the builds, or is my ATA controller >> having bigger issues? >> >> Lot of small files perhaps? What kind of protection have you used? RE> Good question. Remember that resilvering is done in time order and from RE> the top-level metadata down, not by sequentially blasting bits. Jeff RE> Bonwick describes this as top-down resilvering. RE> http://blogs.sun.com/bonwick/entry/smokin_mirrors RE> From a MTTR and performance perspective this means that ZFS recovery time RE> is a function of the amount of space used, where it is located (!), and the RE> validity of the surviving or regenerated data. The big win is the amount of RE> space used, as most file systems are not full. Nevertheless with lot of small files written over many months (some were removed) resilvering in raid-z2 is SLOOOW, even if there's no other activity in a pool (7-10 days on x4500 with 11disk in raidz2 group). Either it's inherit in such environments or something else is wrong. -- Best regards, Robert mailto:[EMAIL PROTECTED] http://milek.blogspot.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
